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No. 607,838. Pa tented July 26, I898.

w. F. DRAPEB & J. H. NORTHROP.

LOOM.

Application filed Dec. 30, 1896.)

(No Model;) 2 Sheets-Sheet. I.

No. 607,838. Patented July 26, I898.

W. F. DBAPER 8|. J. H. NORTHRDPL 2 Sheets-Sheet 2.

L O 0 M (Application filed Dec. 30, 1896.) N o M o d e I.)

ZbZZlcuwlL'Oraper UNITED STATES PATENT EErcE.

\VILLIAM F. DRAPER AND JAMES H. NORTHROP, OF I-IOPEDALE, MASSA-OHUSETTS, ASSIGNORS TO THE NORTl-IROP LOOM COMPANY, OF SAME PLACE ANDSACO, MAINE.

LOOM.

SPECIFICATION forming part of Letters Patent N0. 607,838, dated July 26,1898. Application filed December 30, 1896. Serial No. 617,441. (Nomodel.)

To all whom it may concern:

Be it known that we, WILLIAM F. DRAPER an d JAMES H. N ORTHROP, ofHopedale, county of Worcester, State of Massachusetts, have invented anImprovement in Looms, of which the following description, in connectionwith the accompanying drawings, is a specification, like letters on thedrawings representing like parts. 7

This invention relates to take-up mechanism for looms wherein provisionis made for letting back the take-up on a double action or operation ofthe weft-fork or filling-detector, which latter operates at every otherpick to detect presence or absence of the filling, as is very common inlooms.

In the Northrop type of looms provided with automatic filling-supplyingmechanism to provide the shuttle with a fresh supply of filling uponexhaustion or failure of the filling at times there will be a pick orperhaps two picks of filling absent in the cloth before thefilling-changer can operate to properly introduce a fresh supply offilling to the shuttle. The take-up mechanism under control of theweft-fork is usually arranged to let back two or more teeth at suchtimes to prevent making a thin place in the cloth, and should thefilling-changer operate improperly and the shuttle misthread evident-1ythere will be still greater opportunity for defects in the cloth.

Our present invention has for its object the production of means toprevent taking up the cloth when the filling is absent for part of apick, and also when the loom misthreads or fails to thread the shuttleproperly when the filling is changed. This is effected by arranging thedetent-pawls of the take-up so that they may allow the take-up to letback twice in succession, it being remembered that the -weft-fork has adetecting motion at every other pick of the loom, and when the loom isrunning properly the take-up pawl acts at every pick. The usual take-upcannot act twice in succession when letting back two or more teeth, thetake-up operating every pick, as it takes more than one pick to resetthe detent in proper working condition.

Figure 1 is a partial sectional View of a sufficient portion of a loomto be understood,

showing the train of gears for the take-up mechanism and with ourinvention applied thereto. Fig. 2 is a partial front elevation of themechanism shown in Fig. 1 at the lefthand side of the loom. Fig. 3 is anenlarged detail View, in side elevation, of the detentpawls in theposit-ion shown in Fig. 1. Figs. 4, 5, 6, and 7 are similar viewsshowing different positions of the detent-pawls, to hereferred to; andFig. 8 shows the pawls in the position assumed after the seconddetecting operation of the weft-fork.

The loom-frame A, the lay A the breastbeam A, the weft-fork Z7 pivotedat Z2 on a slide b movable in a stand 6 mounted on the breast-beam, theprojection c at the rear end of the slide against which normally acts alever 0 pivoted at o and jointed by a link 0 to an arm 0 of therock-shaft or operatingshaft d, and the weft-ham mer A and its connectedoperating-lever A are and may be all substantially as shown in UnitedStates Patent No. 529,943, dated November 27, 1894, wherein like lettersare employed to designate like parts.

The usual ratchet-wheel a of the take-up mechanism, connected by a trainof gears to the take-up rolls in well-known manner, is operated by apawl a on a pawl-carrier a actuated by a earn a to rotate in suitablemanner, the pawl-carrier being extended forward at a, Fig. 1, for apurpose to be described.

A bracket B, suitably secured to the loom side, is provided with a studB on which is pivotally mounted the main detent f and twolongitudinally-slotted let-back pawls g and h, the detent having a lugor projection f thereon, over which the end a of the pawl-carrier anormally slides.

The detent f is shown as having an upturned web f secured to or integralwith it, leaving a slot-like opening between, in which the letback pawlsg and h play, the detent being upturnedto form an arm f in the path of afinger 0 fast on the lower end of the lever. 0

r The let-back pawls gandh have 9 3 of different lengths, the pawl hbeing'slotted to let back two teeth of the ratchet-wheel, while the slotin the pawl g lets back four teeth, so that the longer slot in thelatter pawl permits a double operation of the pawl h.

The pawl g engages the ratchetwheel Lt back of the detent f, and thestud b is extended through the longitudinal slot g in said let-back pawlg, while the pawl h engages the ratchet-wheel between the pawl g and thedetent f,'as clearly shown in Figs. 1, 3, 5, 6, and 8, the stud b beingextended through the longitudinal slot h in the pawl h, it being clearfrom the drawings that the slot h is the shorter.

A dog is pivoted at 7t" on the portion f of the detent f, having astop-pin 70 to enter a groove f in the party, a spring 5 normallydepressing the dog into the position shown in the drawings, the pin 70limiting the downward movement of the dog. The free end of the dog ishooked at 70 to be at times engaged by a hook h2 on the pawl h after thefirst detecting movement of the weft-fork, the latter having a detectingmovement at every other pick of the loom.

In the operation of the apparatus upon failure of the filling theweft-fork b will not be tipped and the end a of the weft-fork slide bacts upon the lever 0 turning it to move the finger 0 rearwardly, Fig.1, the said finger in turn engaging the arm f and raising the detent ffrom the ratchet-wheel a. At the same time the lug f acts to lift thepawlcarrier at and disengage the actuating-pawl a from theratchet-wheel, so that the latter is free to turn backward, the pawl abeing thus prevented from operating on that pick. When the ratchet-wheelis thus released, it turns back the pawls g and h sliding on the stud buntil the lower end of the shorter slot h brings up against the stud andthe letback of the cloth is stopped, (see Fig. 4,) the ratchet-wheelhaving been let back two teeth in this instance, the movement of thepawl 77. bringing the hook 7L thereof into position below the hooked endk of the dog 70, when the detent f returns to normal position at thenext pick, such position off being shown in Figs. 1, 2, and 3.

The position of the parts shown in Fig. 4 is assumed on thedetecting-pick of the 100111, and on the next pick the filling-fork doesnot detect.

hooking into it, and the dog would be in the position shown in said Fig.5 until operation of the actuating-pawl a, just referred to, to take upone tooth of the non-detecting beat of the lay. This taking up of theone tooth moves the pawls g and h forward one tooth,

or from the position shown in Fig. 5 to that shown in Fig. 6, suchforward movement of the let-back pawl 71. carrying its hooked end farenough forward to permit the spring 8 of the dog to depress the latterand bring its hooked end 70 into engagement with the hook 7L2. If thefilling-carrier was not properly inserted in the shuttle or a misthreadoccurred, the weft-fork would not be tipped on the third pick of theloomthat is to say, on the pick following the one wherein the partsassumed the position shown in Fig. 6-and on such failure of the fillingthe detent f will be lifted as before; but this time the engagement ofthe dog 70 with the pawl It will cause the latter also to be lifted,disengaging it from the ratchet-wheel, as shown in Fig. 7, and the wheelwill turn back until the lower end of the longer slot g in the pawl gmeets the stud b letting back three more teeth and holding theratchet-wheel at that point, the ratchet having thus been let back atotal of four teeth altogether. At the next or nondetecting pick thedetent-pawl is lowered, the parts assuming the position shown in Fig. 8,and the pawl a will on such pick move the ratchet-wheel forward onetooth, and such movement, acting on the point of the pawl h, will movethe latter forward sufficiently to release the hook 72. from the dog 70,and thereafter both pawls will slide forward to normal position (shownin Fig. 3) as the ratchet-wheel is moved forward tooth by tooth.

Of course it the fillingis absent for one pick the cloth will be letback for a distance controlled by the pawl h, and the pawl g will notexercise any control upon the ratchetwheel.

So far as we are aware it is broadly new to control the take-upmechanism of a loom by the double or successive operation of theweftfork in the manner hereinbefore set forth to thereby regulate theamount of let-back according to the number of picks in which the fillingfails, and our invention therefore is not limited to the preciseconstruction and arrangement herein shown.

Having fully described our invention, what we claim, and desire tosecure by Letters Patent, is

1'. In a loom, take-up mechanism, including a ratchet-wheel, and aplurality of successively-operative let-back pawls to engage saidratchetwheel, combined with a weftfork, and means controlled by doubleoperation of said weft-fork to render one of said pawls inoperative andthereby permit the other pawl to operate, substantially as described.

2. In a loom, take-up mechanism, including a ratchet-wheel and itsdetent, a weftfork, and connections between it and the detent, operativeupon failure of the filling to disengage the detent, combined with twoletback pawls to successively control the ratchetwheel, and means todisengage the initiallyacting pawl upon a double operation of theweft-fork, substantially as described.

3. In a loom, take-up mechanism, including a ratchet-wheel and itsdetent, a weftfork, and connections between it and the detent, operativeupon failure of the filling to disengage the detent, combined with twoindependently-operative let-back pawls to suecessively control theratchet-wheel,and means governed by release of the detent to disengagethe initially-acting pawl upon a double operation of the weft--fork,substantially as described.

4:. In a loom, take-up mechanism, including a ratchet-wheel, and itsactuating pawl and detent, a weft-fork, and connections between it andthe said pawl and detent, to render them inoperative upon failure of thefilling,combined with a plurality of successivelyoperative let backpawls to control the ratchet-wheel one after the other, and meanscarried by the detent to disengage the initially-acting let-back pawlupon a double operation of the weft-fork, substantially as described.

5. In a loom, take-up mechanism, including a ratchet-wheel and itsdetent, and two let-back pawls engaging said wheel at difierent pointsback of the detent, said pawls being longitudinally movable differentdistances on a common support, combined with a weft-fork, connectionsbetween it and the detent, to release the latter upon failure of thefilling, and a dog on the detent, to engage and move theinitially-acting pawl upon a double operation of the detent,substantially as described.

In testimony whereof we have signed our names to this specification inthe presence of two subscribing Witnesses.

WILLIAM F. DRAPER.

JAMES H. NORTHROP.

Witnesses:

HERBERT S. MANLEY, GEo. OTIS DRAPER.

